How to Count Macros: A Beginner's Guide

Counting macros means tracking the three nutrients that make up your calorie intake: protein, carbohydrates, and fat. To start, calculate your daily calorie target, split it into macro targets (for example 25% protein, 45% carbs, 30% fat, the calculator’s balanced default), convert those percentages to grams, and log what you eat against them each day, using per-100 g values like those in the food reference. Logging gets faster as your regular meals are saved.

What are macros?

Macronutrients are the nutrients your body needs in large amounts, and each contributes calories:

Calories measure how much you eat. Macros describe what that intake is made of, and protein intake in particular affects how much of a weight change is lean mass.

How do I calculate my macro targets?

1. Estimate maintenance calories. Use a resting-energy equation such as Mifflin–St Jeor multiplied by an activity factor; the macro calculator does this for you, and how many calories should I eat a day shows the arithmetic.
2. Adjust for your goal. Eat below maintenance to lose fat and modestly above it to gain muscle; one review of lifters suggests a surplus of roughly 10–20%.
3. Set protein first. 0.7–1 g per pound of bodyweight (about 1.6–2.2 g per kg) is the widely used range for active people.
4. Split the rest between carbs and fat by preference. The evidence for one specific split being superior is weak; adherence matters more.

These are starting points, not prescriptions. Track for two weeks, compare against what your weight actually does, and adjust. For medical conditions, consult a professional.

Worked example

A 30-year-old man, 80 kg and 180 cm, moderately active, aiming to lose about 0.5 kg a week, with the balanced split. These are the numbers the macro calculator gives for him:

Turning percentages into grams

A percentage of calories becomes grams in two steps: multiply the calorie target by the share, then divide by that macro’s calories per gram, 4 for protein and carbohydrate and 9 for fat. That is why 30% fat is far fewer grams than 30% protein: 600 kcal of a 2,000 kcal day is 67 g of fat but 150 g of protein. Set the targets you will actually log in grams; the percentages are only the way you chose them.

Logging it accurately

• Weigh, don’t estimate, at least for the first weeks. With a kitchen scale in grams, the log is as exact as the database entry behind it.
• Match the entry to the state you weighed. Raw and cooked weights of the same food differ a lot, because cooking loses or gains water.
• Use the barcode for packaged food and search for whole food. Barcode vs search vs photo scan covers when each is right, and how food databases work explains why two apps disagree.

Why do most people quit tracking?

Because logging takes effort. Studies of app-based food logging find it declines over time (in one, fewer than half of participants were still logging after week 10), and the effort each entry takes is a recognised reason. The fix is not more willpower; it is reducing seconds per log: repeat meals, favorites, and quick-add for the foods you eat most.

Where to go from here

• Macros vs calories — whether you need to track both, and when calorie counting alone is enough
• How much protein per day — the evidence behind 1.6–2.2 g/kg, and why the RDA isn’t your target
• The best macro split for cutting — worked numbers for a fat-loss phase
• Highest protein per calorie — foods ranked for reaching a protein target inside a calorie budget

Sources

• Food and Agriculture Organization of the United Nations (2003). Food energy – methods of analysis and conversion factors. FAO Food and Nutrition Paper 77, Rome. Chapter 3: energy conversion factors
• Mifflin MD, St Jeor ST, Hill LA, et al. (1990). A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition 51(2):241–247. doi:10.1093/ajcn/51.2.241
• Morton RW, et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. doi:10.1136/bjsports-2017-097608
• Iraki J, Fitschen P, Espinar S, Helms E. (2019). Nutrition recommendations for bodybuilders in the off-season: a narrative review. Sports (Basel). doi:10.3390/sports7070154
• Johnston BC, et al. (2014). Comparison of weight loss among named diet programs in overweight and obese adults: a meta-analysis. JAMA. doi:10.1001/jama.2014.10397
• Turner-McGrievy GM, et al. (2019). Defining adherence to mobile dietary self-monitoring and assessing tracking over time. Journal of the Academy of Nutrition and Dietetics. doi:10.1016/j.jand.2019.03.012
• Showell BA, Williams JR, Duvall M, et al. (2012). USDA Table of Cooking Yields for Meat and Poultry. USDA Agricultural Research Service, Nutrient Data Laboratory. PDF

Frequently asked questions

Do I need to hit my macros exactly? No. A tolerance of ±5–10 g per target is a practical rule of thumb for a successful day, and the weekly average matters more than any single day.

Is counting macros better than counting calories? It includes calorie counting, since your macros determine your calories, but adds the composition dimension that matters for body-composition goals.

Should I weigh food raw or cooked? Either works if the database entry matches what you weighed. For meat and rice cooked at home, weighing raw is the usual recommendation, because how much water cooking removes or adds varies with method and time.

Where does alcohol go? Alcohol carries about 7 kcal per gram and is none of the three macros. Log it so the calories count, and expect your three macro totals not to add up to the full calorie figure on days you drink.

How long should I track? Some people track strictly for a few months, learn what their normal meals contain, then shift to lighter-touch tracking.